Subtitle Duration
Count subtitle cues and total the amount of time they remain visible.
How to use the Subtitle Duration
What does the Subtitle Duration do?
Count subtitle cues and total the amount of time they remain visible; It applies this page-specific rule: total displayed time adds the duration of every cue.
Which inputs does this tool use?
To count subtitle cues and total the amount of time they remain visible, enter Subtitle content, Input format, Duration report; keep every value in the same example; where available, choose between Detect SRT or WebVTT, SRT, WebVTT to match the required format; select Measure subtitle duration when the values are ready; Start with a familiar case covered by this rule - The report also includes average cue duration, the first start, and the last end - so the expected result can confirm the settings.
How should the tool result be read?
For a result intended to count subtitle cues and total the amount of time they remain visible, the report also includes average cue duration, the first start, and the last end; read duration report together with the original subtitle content rather than as an isolated answer, and confirm that its units or structure match the intended use.
Why can displayed time exceed the timeline span?
When the goal is to count subtitle cues and total the amount of time they remain visible, overlapping cues are each added to displayed time.
Is this the video duration?
When using the page to count subtitle cues and total the amount of time they remain visible, no.
Limits and accuracy
When using this tool to count subtitle cues and total the amount of time they remain visible, this tool measures subtitle cues, not the video file; check the result in its intended destination before relying on it for important work; keep subtitle content until the output has been checked in its intended destination.
Displayed time versus timeline span
Total displayed time adds the duration of every cue. If two cues overlap, both durations contribute to the total. Timeline span measures from the earliest cue start to the latest cue end.
The report also includes average cue duration, the first start, and the last end. These figures can help identify unusually dense or sparse subtitle tracks.
This tool measures subtitle cues, not the video file. A subtitle track may begin after the video starts or end before the video finishes.
Frequently asked questions
Why can displayed time exceed the timeline span?
Overlapping cues are each added to displayed time.
Is this the video duration?
No. It measures the subtitle cues only.
Are gaps included?
They affect timeline span but are not added to total displayed time.